INDEX 



1 107 



Rhopalocerca tardigrada, 421 



Rhopalocercous cercariae, 421 



Rhyacophilidae, 936 



Rhyncheta, 299 



Rhynchobdellae, 651 



Rhynchodemidae, 360 



Rhynchodemus alrocyaneus, 360, sylvatkus, 360 



Rhynchomesostoma, 349; roslratum, 349 



Rhynchomonas, 246; nasula, 246 



Rhynchoprobolus papillosus, 361, 363 



Rhynchoscolex, 337; simplex, 337, vejdovski, 

 337 



Rhynchotalona, 724; falcata, 724 



Rhyphidae (larvae), 945 



Rhythms of fresh-water organisms, 43; daily 

 depth migrations vs., 43 



Rhyzota, 574 



Richteriella, 154; botryoides, 154, globosa, 154 



Rivularia, 114; minutula, 114 



Rivulariaceae, 113 



Rostellum, 424 



Rotatoria (wheel animalcules), Fresh-Water, 

 16. 553-620; body, 554, corona, 554, 557, 

 the chief organ of locomotion, 562, cosmo- 

 poUtan characteristics, 578, development, 

 582, eggs, 580, excretory organs, 560, foot, 

 554, jaws (trophi), 558, 559, key, 587-619, 

 mastax, 558, 560, methods of study, 583, 

 minute^ males, 580, nervous system, 563, 

 Notommatidae as example, 535, occurrence, 

 554, references, 620, relationships, 586, 

 reproduction, 564, species (perennial), 581, 

 (summer), 581, (winter), 581, structure, 554, 

 579, trophi, 558, 559, variations of type 

 among Anapodidae, 570, Anuraedae, 571, 

 Asplanchnidae, 571, Bdelloida, 576, Branch- 

 ionidae, 570, Coluridae, 568, Dinocharidae, 

 569, Euchlanidae, 568, Floscularida, 572, 

 Flosculariidae, 572, Gastropodidae, 570, 

 Hydatinidae, 569, MeUcertida, 574, Notom- 

 matidae, 566, Notopsidae, 569, Ploe- 

 somidae, 570, Rattulidae, 568, Rhizota, 

 574, Salpinidae, 567, Seisonacea, 577, 578, 

 Synchaetidae, 566 



Rotifer, 619; citrinus, 619, neplunius, 619 



Rotifera; see Rotatoria 



Rotundaria, 999; iubemdata, 999 



Roundworms (Nemathelminthes), Fresh- 

 Water, 15; free-living; see Nematoda, 

 Free-Living; parasitic; see Acanthoceph- 

 ala; Gordiacea; Nematoda, Parasitic; 

 Parasitic Roundworms; Parasitic Worms 



Rugifera, 1006 



Sagitlaria chinensis, 183, nalans, 183 

 Salpina, 593; spinigera, 593 

 Salpingoeca, 258; conmllaria, 258 

 Salpinidae, 567, 593 



Sanitary Problems, Technical and, 1067- 

 1083; see Problems, Technical and Sanitary 



Saprophilus, 279; agilans, 279 



Sarcodina (amoeboid protozoa), 14, 210-237; 

 conjugation, 217, food, 212, 215, habitats, 

 211, key, 219-236, metabolism, 216, meth- 

 ods of study, 218, references, 236-237, 

 reproduction, 216, shells, 214, structure, 

 211; see Protozoa 



Sayella, 979 



Scalenaria, 1008 



Scapholeberis, 699; aurila, 699, mucronala, 693 



Scaridium, 597; longicaudum, 597 



Scenedesmus, 159; quadricauda, 159 



Sciadium, 158; arbuscula, 158 



Scirpetum, 196 



Schistocephalus, 432 



Schistosomatidae, 409 



Schistotaenia, 448; macrorhyncha, 448 



Schizamphistominae, 387 



Schizocanthum, 141; annalum, 141 



Schizocerca, 605; diiersicornis, 605 



Schizochlamys, 150; gelatinosa, 150 



Schizoraeris, 162; Icibleinii, 163 



Schizonema, 128 



Schizomycetes; see Bacteria 



Schizothrix, 109; rubella, 109 



Schizophyceae; see Algae, Blue-Green 



Schmardaella, 638; filijormis, 638 



Scolex, 424 



Scotinosphaera, 157; paradoxa, 157 



Scuds, 828; see Malacostraca 



Scutopterus (adult), 941 



Scyphidia, 292; fromentelHi, 292 



Scytonema, 112; mirabile, 112 



Scytonemaceae, iii 



Seasonal succession of fresh-water life (biol- 

 ogy), 10 



Seasonal temperature changes, 2,Z 



Secondary host; see Host, secondary 



Sedgewick-Rafter cell, 82, sand filter, 83 



Segmentina, 984; armigera, 984 



Seines, 61 



Seison annulalus, 578 



Seisonacea, 577, 57S 



Selenastrum, 159; gracile, 159 



Sepedon, 913 



Sericostomatidae, 936, 937 



Serphus, 933 



Setiferous cercariae, 423 



Shore zone, 3 



Shrimps, 828; see Malacostraca 



Shrimps, fairy; see Crustacea; Phyllopoda 



Sialididae (spongilla flies), 897-898; adults, 

 935; see Insecta; Neuroptera 



SiaUs (adult), 935, (larva), 935; infumata, 898 



Sida, 689; cryslallina, 689 



Sichdae, 689 



Simocephalus, 698; exspinosus, 698, serru- 

 laius, 699, velulus, 698 



SimuUidae (black-flies), 913; larvae, 946; see 

 Diptera; Insecta 



